Pneumatic tire.



W. DRURY. PNEUMATIC TIRE APPLICATION FILED APB. 14,1905. 898,850.

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W. DRURY. PNEUMATIG'T E.

' APPLIVOATION FILED APB.14,1905.

2 sums-SHEET 2.

WW WW W WILLIAM DRURY,' OF SWANSEA, WALES ENGLAND.

PNEUMATIC TIRE.

Specification of Letters Patent.

Patented. Sept. 15, 1908.

Application an April 14, 1905. Serial No. asasaoa.

To all whom it may concern: 1 Be it known that I, WILLIAM DRURY, a subj ect of the King of Great Britain and Ireland,

residing at N o. 29 Orad'ock street, Swansea,

in thecounty of Glamorgan, Wales, England,-

have invented new and useful Im rovements in Pneumatic Tires, of which t e fol lowing is a specification.-

My invention relates to improvements in pneumatic tires by means of advantages are obtained.

My tire embraces two main arts, an outer cover which for urposes o distinction I shall term the tread cover, and an inner cover which for purposes of distinction I shall term the strain cover; and the distinguishing feature of these two main parts is that when placed in position with respect to one another and u on the wheel they interlock. This interloc ing is efle'cted or assisted by inflation. The inflation'ma take place in an-ordinary inflation tube of t e usua type, placed within the strain cover, but in one form of my invention the strain cover may itself constitute the inflation tube. I however prefer to employ an inflation tube wherever rough usage is expected.

In the accompanyin drawings which illustrate certain preferred orms ofmy invention, Figure I, is the tread cover shown as separated from the strain cover. Fig. II shows a strain cover detached from the tread cover.

Fig. III illustrates the tread and strain covers shown in Figs. I and II respectively placed in terlock. This 1s easily e ecte'd by first plac- After such ingthe projection 4 within recess 2 and then moving projection 5 into the recess 3 so that the two covers interlock. This placin of the parts in position is facilitated by the ivision of the strain cover at the line or opening 6:. lacing in position as aforesaid and within t e rim the arts take up the position shown in Fig. II When an inflation tube is employed it takes up the position which certain out tearin suitable for heavy Wagons or lorries.

shown by the dotted circle 7 in Fig. III as will be readily understood. But it will be seen that with a strain cover within a tread cover as shown a se arate inflation tub'emay be dispensed with, in which case the division v6 is also preferably dispensed with. The-rim shown in Fig. III consists of two steel halves 8 and 9 attached by the flanges 10, 11, to the felly 12 by means of a bolt and nut as shown. In Figs. IV and V it will be seen that the projections 14 nest within the recesses 15 and are placed close to the inner part of the tire instead ofbeing' laced close to the periphery as shown in Fig. III. This is a stronger form of construction for when the parts are "in position within the rim and fully inflated much greater strains can be withstood withthe twocovers apart. The tire shown in igs IV and V is therefore designedfor heavier and harder work than that shown in Figs. I and II. When still greater strains have to be dealt with I adopt the plan shown in Figs. VI and VII, VIbemg a strain cover and VII a tread cover. In this form it be seen that there is a'double set of projections and recesses the projections 16, 17, nesting within the recesses 18, '19, the projections 20, 21, within the recesses 22, 23, 1

the projections 24, 25, within the recesses 26, 27, and the projections 28, 29, within the recesses 30, 31. It will be seen that the tread cover shown in Fig. VII differs from those shown in Figs. I and V not onl in having a double set of projections an recesses but also in the fact that its inner, portion consists of two overlapping parts 32,. 33.

This overla ping not only reduces theimportance o employing a separate inflation tube but it adds considerably to the strength of construction. But even in this form I still prefer to employ a separate inflation tube. The dotted lines 3t, 35, indicate the edges of the rim. Studs of=the usual kind to prevent creeping may be employed if desire In Fig. VIII I illustrate a form of twin tiIrIe this fi ure 36 is a separating ring of steel attached to the folly 12 by the countersunk screws 37, 38 is a ring of rubber surrounding the ring 36 and lyin between the treads of the twin tire. This figure also serves to illustrate a form of construction in which the rim is provided with annular recesses 39 desi ned 11o for the reception of annular lugs of ru her with canvas insertion which are retained in recesses and int single tires in which case I m oy provide. a lug on each side of the tread cover in practice I sometimes find it convenient to spread it thin layer of thin rubber solution on the cute surface of the strain cover or on 'tla. innnei' surface of the tree l cover before Putting lthe/3c in their intcrlon i n n to the into-nor al the tire when desired es the two parts mentioned can be readily stripped crt. Such e layer of solution diminishes the chances of relative creeping between the strain end the tread covers and particularly applicable where there is only one set of tions and recesses. having thus described my invention what .i claim :is new and desire to secure by Letters Patent is 1. in a. pneumatic tire, the combination of on inner strain cover divided longitudinally u )011 its outer part, on outer tread cover divided longitudinally upon its inner part, interlocking 'lneens intermediate between seid "covers, such means acting to interlock the ports under inflation, said interlocking means comprising longitudinally extending erlocking projections.

2. In it pneumatic tire, the combination of on inner strain cover divided longitudinally upon its outer ert v an outer tread cover divided longitu inslly upon its inner part,

does not zwevent ready access 1 sponding projections on covers interlocking with eechother under sossso interlocking means intermediate between said covers, such means acting'to interlock the parts under inflation, seid interlocking means comprising longitudinally extending recesses on the inner walls of said tread cover and corresponding longitudinally extending projections on the outer wells of said strain cover. 1 4

3. In a pneumatic tire, the combination of on outer tread cover divided longitudinally, an inner strain cover divided longitudinally, and the letter nested Within the former, and the longitudinal edges of one of said covers overla )ping each-other, and longitudinally eXten ing interlocking recesses and come said respective inflation.

4. In a pneumatic tire, the combination of an outer. interlocking tread cover divided longitudinally, an inner strain cover also divided longitudinally and nested within sairl outer cover, interlocking means intermediate be-;

tween said covers and comprising longitudinally extending recesses and projections adapted to interlock with each other under inflation.

In witness whereof I have signed my name to this specification in'the presence of two subscribing witnesses.

WILLIAM DR URY. Witnesses H. D. JAMESON, F. L. RAND. 

